Project: Time Zone Converter Microservice

Overview: A gRPC service where a client sends a request with:

1. A timestamp (in UTC or any other timezone)

2. A target timezone

The service responds with the equivalent timestamp in the target timezone.

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Features:

1. Proto Definition: Define a .proto file with:

   • A ConvertTimeRequest message containing the timestamp and target timezone.

   • A ConvertTimeResponse message containing the converted timestamp.

   • A TimeZoneConverter service with one method, ConvertTime.

2. Server Implementation: Implement the TimeZoneConverter service in Golang:

   • Use the time and github.com/rickar/cal libraries for timezone conversions.

   • Handle basic errors (e.g., invalid timezones).

3. Client Implementation: Write a simple Golang client that:

   • Accepts input for timestamp and timezone via command line or hardcoded values.

   • Calls the gRPC server and prints the converted timestamp.

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Explanation

1. Parsing the Time:

   • The input time (2024-12-04T15:00:00Z) is in UTC, so it’s parsed using time.Parse with the time.RFC3339 layout.

   • The result is a time.Time object in the UTC time zone.

2. Loading the Target Time Zone:

   • Use time.LoadLocation with the IANA time zone name (e.g., America/New_York).

3. Converting Time:

   • The In(location) method converts the time to the desired time zone.

4. Output:

   • Print both the original UTC time and the converted time for verification.

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Testing

Run module tests:

go run main.go

go test -v

Example grpcurl Command with .proto File:

grpcurl -plaintext \
  -import-path ./proto \
  -proto api.proto \
  -d '{"timestamp": "2024-12-04T15:00:00Z", "target_timezone": "America/New_York"}' \
  localhost:8080 \
  timezone.TimeZoneConverter/ConvertTime

Explanation:

-import-path ./proto: Specifies the directory where your .proto file is located (adjust the path accordingly).

-proto timezone.proto: Specifies the .proto file that contains the service definition.

-d: Specifies the JSON payload, as in the previous example.

localhost:50051: Replace with your actual server address.

timezone.TimeZoneConverter/ConvertTime: Specifies the full service and method name, as per your .proto file.